Drill-lock.



I gage the 'drill, a'ndto provide novel means fiENnY s. GRIFFIN, onPIQUA, OHIO.

ravens;

Siietiification of Letters Patent.

rat eareairar. 21, 1916.

Applicationfiledflctober11, 1915. seriauvasaass.

To all whom it mag concern:

Beit known thatxl, I'IENRY S. GRIFFIN, a citizen of the United Statesresidingat Piqua, in the county of Miami and State of "Ohio, haveinvented anew and useful Drill-Lock of which the. following is aSpecification.

The device forming the subject matter of this application is a drilllock, adapted to. hold againstrotation with respect to a drill rod, adrill which has a threaded connection with the drill rod.

, The invention aims to provide a locking member of novel form, movablewith respect to the drill rod and adapted to enwhereby a movement o fthelocking member maybe prevented.

Another ob ect of the invention is to provide a structure of the typeabove described in which the locking parts will not the invention hereindisclosed can be made deteriorate due to rust or otherwise.

It is within the province ofthe disclosure to improve generally and toenhance the utility of devices of that type to "which the presentinvention appertains.

With the above and other objects in view which will appear as thedescription proceeds, the, invention resides. inthe con-ibination andarrangement of parts and in the details of constructionhereinafterdescribed and claimed, it being understood that c'hangesin the preciseembodiment of within the scope of what is claimed, without departingfrom the spirit of the invention.

In the accompanying drawing:Figure 1 shows the invention in sideelevation, parts being broken away, the locking mechanism being in thepositions assumed when the drill is upheld to the drill rod; Fig. 2

is a cross section on the line 2-2 of Fig.1;

- a threaded recess at formed in the lower end of the drill rod theshank 3 defining a transverse shoulder 5 in the drill 2 about the shank.In the shoulder 5, to-one side of the threaded shank 3 a recess 6is'formed and in. the lower endof the drill rod 1 tooneside of thethreaded recess ehandpen- 7 is formed, the opening 7 being adapted to bealined vertically with the seat 6 under conditions which will be pointedout hereinafter. F or-med in the drill rodl and co1nmunicatmg with theopening 7 in the lower end of the drill rodis an upright passage 8, theupper end of which is threaded as indicated at 9. At its upper end. thepassage 8 crm-municates with a lateral recess 10 formed in the drillrod. 1. y

Movablefllongitudinally for adjutsment in the pa'ssage 8 ;is lockingmember 11 preferably in the formof a rod, the upper extremity of thelocking memberll being threaded as shown at 12 so as to cooperate withthe threaded portion 9 of the passage 8. In the upper end of the lockingrod 11,a screw driver kerf 14 is formed, the

kerf 14: being accessibleby way of the recess "10 in the drill rod 1.

end of; therod 11 is journaled for rotation a in the latch block 15 andis held thereto for rotaticn by means of a screw 16 threaded into thelower end of the rod. the screw 16 having a screw driver kerf 17.

The inventirn comprises a plug 18 adapted to be threaded into the upperend 9 of the passage 8 in the drill 1, under ci cumstances which willbepointed out hereinafter, the plug 18 being provided with a screw driverkerf 19 which is accessible through the recess 10 in the drill rod 1.Upon the exterior surfaces cf the drill rod 1 and the drill 2, marks 20are formed.

In practical operation, the plug 18 is threaded cut of the end 9 of thepassage 8. Then a screw driver is applied to the kert 17 of the screw16. the rod 11 being rotated, and the latter turning in the latch block15. WVhen the rod 11 is rotated. the rod m ves upwardly into theposition shown in Fig. 3, because the upper end 12 of the rod isthreaded into the portion 9 of the passage 8. Ult mately. the l wer f ceof the latch block 15 i disposed flu h with the lower fa cc of the drillrod 1 as shown in Fig. 3 of the drawings. When the parts are thusarranged, the shank 3 of the drill 2 may be,

threaded into the recess 4--in the drill-rod 1. Relative rotationbetween the drill rod 1 and the drill 2 is continued until the marks20-on the drill-and the drill red are lined up vertically. When themarks 20 are lined up vertically, the seat 6 in the drill 2 is lined upvertically with the opening 7 in the drill rod 1. Then, through therecess 10 in the drill red 1,a screw driver is applied to the kerf 14 ofthe rod 11 and the latter is moved downwardly, because it is threaded asshown at 12 into the part 9 of the passage 8. As the rod 11 movesdownwardly,

it rotates in the latch bloclr15 and carries rod 11 to lock the sameagainst rotation.

When the parts are disposed as above described, it will be obvious thatrelative rotary "movement to any appreciable extent between the drillred 1 and the drill '2 will be impossible. If desired, however, aslightrelative rotation between the drill and the drill rcd may be broughtabout, sothat the marks 20 are disposed slightly out of the position ofalinement shown in Fig. 1, the latch block 15 under such circumstances,being firmly gripped by the drill 2. v

The threaded plug 18, the red 11 and the latch block 15 ordinarilyaremade out of brass or some similar metal which will not rust ordeteriorate rapidly.

Having thus described the invention, what is claimed is I 1. In a deviceof the class described, a

drill and a drill holder having athreaded connection, the drill having aseat; a screw threaded into the drill holder and disposed longitudinallythereof; and a latch block in which the screw is journaled, the latchblock being movable by the screw to engage with theseat.

"2. 1na device of the class described, a

drill and a drill holder having a threaded connection, the drillholderhavingaseat;

a screw threaded intothedrill holder and provided with means forengaglng the seat; and a second screw disposed coax ally with the'firstspecified screw and threaded into;

the drill holder, the second screw being adapted to co-act with thefirst specified screw to prevent a rotation thereof. v

3. In a deviceof the class described, a

drill and a drill holder having-a threaded connection, the drill havingaseat, a primary screw disposed longitudinally ofthe drill holder andthreaded thereinto; a latch block in which the screW' is journaled, thelatch blockbelng movable under the action of the screw to engage withthe seat; and a second screw disposed axially'with respect to theprimary screw and threaded into the drill holder, the second screw beingadapted.

to cooperate with the primary screw. to prevent a longitudinal movementthereof, and

to prevent a retraction of the latc h block' from the seat.

In testimony that I claim the foregoing as 7 my own, I'have heretoaflixed'my signature in the presence of twowitnesses. V g

, i HENRY ssRIrFIN. Witnesses:

EDWARD H. ALLEN, W. E. Moore.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). (1. i

